Reclaim Disk Space Monitor the Database Performance

7-6 Oracle Fusion Middleware Performance and Tuning Guide ■ The type of customization that has been created shared or user level ■ The percentage of metadata objects in the system which is customized. The lower this percentage the lower the impact of customization. ■ The number of configured customization layers, and the efficiency of the customization classes. There are two main types of customization: ■ Shared Customizations: these are layers of customization corresponding to customization classes whose getCacheHint method returns ALL_USERS or MULTI_USER, meaning the layer applies to all or multiple users. Shared customizations are cached in the shared MDS cache. ■ User Level Customizations also known as Personalizations: these are layers of customization corresponding to customization classes whose getCacheHint method returns SINGLE_USER, meaning the layer applies to just one user. User customizations are generally cached on the users session HttpSession until the user logs out. For more information about customization concepts, writing customization classes, and configuring customization classes, see Customizing Applications with MDS in Oracle Fusion Middleware Fusion Developers Guide for Oracle Application Development Framework.

7.7 Understanding DMS metrics and Characteristics

MDS uses DMS sensors to provide tuning and diagnostic information which can be viewed using Enterprise Manager. This information is useful, for example, to see if the MDS caches are large enough. Information on DMS metrics can be found in the Fusion Middleware Control Console. Click Help at the top of the page to get more information. In most cases, the Help window displays a help topic about the current page. Click Contents in the Help window to browse the list of help topics, or click Search to search for a particular word or phrase. Part III Part III Oracle Fusion Middleware Server Components This part describes configuring Oracle Fusion Middleware server components to improve performance. It contains the following chapters: ■ Chapter 8, Oracle Application Development Framework Performance Tuning ■ Chapter 9, Oracle TopLink EclipseLink JPA Performance Tuning ■ Chapter 10, Oracle Web Cache Performance Tuning